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TAS5631 on PHD or DKD package?

Marco Salvaneschi
Prodigy 50 points


Hi gents,

As written above, witch is the best and the easiest case to use among the two?

The 5631 data sheet reports better thermal performances of the PHD one despite his small exposed pad. with respect to the DKD.

Furthermore, I noticed that the PHD metal pad is slightly recessed, making it difficult to use with a conventional flat heatsink.

So, I'll go for the DKD case.

Am I doing right or not?

For what I understood, the pad must be electrically connected to GND, why?

Thank you and regards.

Marco. 

  • 0
    TI__Guru**** 189401 points

    Hi, Marco,

    PHD is the better choice!!!

    There is no recess on the PHD package. What data led you to that conclusion?

    The pad needs to be grounded to give stray currents a path to ground. Switching currents at this level is not trivial! For the same reason we prefer PHD - more ground pins = better grounding = better robustness!

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 50 points

    Don Dapkus said:

    Hi, Marco,

    PHD is the better choice!!!

    There is no recess on the PHD package. What data led you to that conclusion?

    The pad needs to be grounded to give stray currents a path to ground. Switching currents at this level is not trivial! For the same reason we prefer PHD - more ground pins = better grounding = better robustness!

    -d2

    Hi Don,

    I measured the flatness with a stainless steel caliber and it looks that the metal pad is lower than the rest of the case.

    Take a look at the pics.

    Marco.